I find that I need to stop food completely for at least 3 months. Currently am having a little once a week to see what happens. My dr says try very very dilute amounts every day & gradually build it up. Have to try and see what works.

I have a few intolerances to food. With regards to dairy, the only thing I can eat without a reaction is yogurt or hard cheese, most likely because of the enzymes and live cultures. I absolutely cannot do ice cream, soft cheese or any % of milk - reaction is pretty swift. I can eat some things with gluten, but I tend to pay for it later and I'd rather not. I guess I'd fall into your "a" category.Some days you're the bug, some days you're the windshield

It depends on the person and their level of sensitivity, and the food.

For me, it depends on the food and even how it is prepared.

I can have dairy- especially yogurt and cheese, and I can use a little half and half in my coffee, but if I have straight milk or ice cream for example, I am guaranteed to have asthma and eczema the next day.

My son cannot tolerate even the smallest, tiniest amount of Red Dye #40 or nitrates. He turns into a beast in 12 hours. Really. His behavior is awful.